A low carbon separation ratio method for mixing and heating blast furnace gas and coke oven gas

By calculating the O/C ratio and H/C ratio of the mixed gas using the HCO system theory, the optimal low-carbon-precipitation ratio of blast furnace gas and coke oven gas was determined, thus solving the carbon precipitation risk during mixed heating and achieving efficient low-carbon-precipitation control and calorific value satisfaction.

CN122382271APending Publication Date: 2026-07-14XINJIANG BAYI IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XINJIANG BAYI IRON & STEEL CO LTD
Filing Date
2026-05-13
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

In existing technologies, the mixing and heating of blast furnace gas and coke oven gas lacks a scientific theoretical basis, resulting in a high risk of carbon precipitation and making it difficult to determine the optimal low carbon precipitation ratio range under different operating conditions.

Method used

Based on the HCO system mass and chemical equilibrium theory, the range of the non-carbon precipitation zone of the mixed gas was determined. Combined with calorific value verification and kinetic carbon precipitation verification, the optimal low carbon precipitation ratio range was accurately determined by calculating the O/C ratio and H/C ratio of the mixed gas. The ratio was then adjusted in real time at the blast furnace production site, and the water-carbon ratio was increased to suppress carbon precipitation.

Benefits of technology

It enables precise determination of low carbon precipitation ratios at different heating temperatures, which not only meets calorific value requirements but also suppresses carbon precipitation, thereby improving the efficiency and safety of gas heating.

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Abstract

This invention belongs to the field of blast furnace ironmaking technology, specifically disclosing a low-carbon-precipitation ratio method for mixed heating of blast furnace gas and coke oven gas. The method defines the H / C and O / C ratio ranges in the non-carbon-precipitation zone based on the HCO system mass and chemical equilibrium theory; and then selects low-calorific-value ratios ≥1200 kJ / Nm³. 3 The invention provides candidate blending ratios and determines the optimal blending ratio of coke oven gas for different temperature ranges. In field application, the blending ratio can be adjusted according to temperature fluctuations. For slight carbon precipitation, the water-to-carbon ratio is adjusted to 1.0-1.2 to suppress carbon precipitation. If the carbon precipitation rate exceeds the standard, the water-to-carbon ratio is increased first; if this is ineffective, the proportion of coke oven gas is reduced. When heating efficiency is low, the water-to-carbon ratio and heating temperature can be fine-tuned while controlling carbon precipitation. This invention addresses the problems of easy carbon precipitation and lack of scientific basis for blending blast furnace gas and coke oven gas during heating. It balances achieving the required calorific value with low carbon precipitation, adapts to the dynamic operating conditions of blast furnaces, improves heating efficiency, and reduces the risk of carbon precipitation.
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